I didn't read this whole debate, only the last couple pages, but IMO Tiger is clearly one of the top athletes (defined as playing a sport) of our generation, in large part due to the fact that he is actually an "athlete" (defined as being athletic). That may sound weird to some, but to me, he showed that being "athletic" could help people become better golfers. Wearing his tight Nike shirts and showing off his chest/arms has changed golf a bit IMO. Maybe it's just me...
Tiger transformed golf in a way that I don't even think Jack did, although I wasn't alive to see him in his prime. Tiger made it "cool" to play golf. Tiger made it cool to get the latest golf shoes. Tiger made it cool for young golfers to have exotic club covers. Tiger made it cool to wear a swoosh on your hat when playing golf.
I'll go back to my first point. Frankly, he just made it cool to play golf. He wasn't old. He wasn't fat. He wasn't boring. That changed golf, and I think his physical image has a lot to do with it.